Google’s Android has taken another step forward with the launch of the Android 2.1 SDK. After checking out the Nexus One, it shouldn’t be too much of a surprise to see that the SDK adds support for animated wallpaper development, changes to signal strength visual output, view selectors for applications and updates to the WebKit rendering engine (to allow for geolocation support). With the SDK released, will we be seeing more phones being upgraded to Android 2.1, and will they be able to challenge the Nexus One?